Marine hull war risk insurance indemnifies shipowners and operators against physical loss of, or damage to, a vessel caused by war, warlike operations, and hostile acts — perils that a standard hull and machinery policy excludes as a matter of course. The product has existed in recognizable form since Lloyd's underwriters first began separating war risk from marine risk during the First World War. What has changed since December 2023, when Houthi-affiliated forces began attacking commercial shipping in the Red Sea, is the price, the breadth of exclusions, and the speed with which the market reprices when a new threat corridor opens.
What Marine Hull War Risk Insurance Covers
A standard hull war risk policy, written on the Institute War and Strikes Clauses (Hulls) 1983 or equivalent London-market wording, covers a vessel against:
- War, civil war, revolution, rebellion, insurrection and civil strife arising therefrom
- Capture, seizure, arrest, restraint, or detainment by any government, person, or group
- Derelict mines, torpedoes, bombs, and other derelict weapons of war
- Piracy (the Institute War Clauses move piracy from the struck-out list back onto cover — standard H&M policies generally exclude it)
- Vandalism and sabotage motivated by political or terrorist purposes
- Confiscation, expropriation, and nationalization by a government
The policy attaches when the vessel enters a covered area, and — for voyage policies — terminates 15 days after the vessel leaves the listed war zone, subject to the automatic termination clause in the event of outbreak of war between the Five Major Powers (US, UK, France, Russia, China).
Period policies run for 12 months and cover the vessel wherever it trades, subject to additional war risk premiums (AWRPs) when trading into JWC Listed Areas. These AWRPs are voyage-specific charges layered on top of the annual premium. Through 2024–2025, base period hull war premiums for most commercial vessels remained nominal in absolute terms, while southern Red Sea AWRPs pushed the effective cost of a single voyage through the Bab-el-Mandeb to many multiples of the pre-crisis baseline, with voyage rates negotiated case by case with underwriters.
What Coverage Does Not Include
The Institute War and Strikes Clauses are precise about exclusions:
- Hostile detonation of nuclear, chemical, biological, or electromagnetic weapons — these are universally excluded and uninsurable in the private market
- War between the Five Major Powers — automatic termination applies; cover ceases within a defined notice period (typically 48 hours) upon declaration
- Arrest by customs or law enforcement acting under civil authority rather than a hostile act
- Seizure in connection with smuggling or other criminal enterprise not constituting a recognized political act
- Ordinary commercial or navigational risks — corrosion, mechanical breakdown, contact damage — which remain with the H&M policy
It is also critical to note the paramountcy clause: sanctions exclusions override war risk policy language. A vessel trading to a jurisdiction subject to OFAC, EU, or UN sanctions will not be covered for a war risk loss in that territory even if all other policy conditions are met. Owners and operators should confirm sanctions compliance before entry into any restricted area.
How Premiums Are Set
Hull war risk pricing operates on two levels: the annual base rate and the additional war risk premium applied voyage by voyage to trade in JWC Listed Areas.
Base Annual Rate
The base rate is set by underwriters against the vessel's:
- Hull value (agreed value under the H&M policy — war risk underwriters shadow this figure)
- Flag state and its historical exposure to state or non-state hostile action
- Trading area declared at inception (worldwide trading typically carries a higher base rate than limited-area trading)
- Vessel type — tankers, bulk carriers, and container vessels each carry distinct risk profiles; LNG carriers attract special rating in areas proximate to the Strait of Hormuz
- Owner's claims history and fleet management quality
In benign market conditions — pre-2022 Black Sea, pre-2023 Red Sea — base hull war rates were largely nominal, sometimes as low as 0.01% to 0.03% of hull value for vessels trading outside recognized war zones. The Russian invasion of Ukraine in February 2022 ended a decade of soft war risk pricing almost immediately.
JWC Listed Areas Surcharges
The Joint War Committee — a committee of Lloyd's and the International Underwriting Association (IUA) representing the London market — publishes and updates a list of geographic areas where trading vessels face elevated war risk. Underwriters are not obliged to follow JWC listings but they function as the recognized reference point; most hull war policies require the owner to notify underwriters and negotiate an AWRP before entering a Listed Area.
Key JWC listing events in recent history:
| Event | Date | Area Listed | Premium Impact | |---|---|---|---| | Black Sea / Sea of Azov | February 2022 | Black Sea, Sea of Azov | AWRPs reached 1%–5% of hull value per voyage | | Southern Red Sea / Bab-el-Mandeb | December 2023 | Yemen/adjacent waters | AWRPs pushed effective voyage rates to many multiples of the pre-crisis baseline | | Strait of Hormuz | Listed on/off since 2019 | Hormuz / Gulf of Oman | Rate-sensitive to Iran–US tension cycles | | Gulf of Guinea | Ongoing | West Africa offshore | Elevated AWRP for tankers and bulkers |
When the JWC added the southern Red Sea to its Listed Areas in December 2023 — following a series of Houthi drone and missile attacks on commercial vessels that accelerated after the October 7, 2023 Hamas–Israel conflict — underwriters repriced hull war coverage within weeks. Vessels that had been paying 0.05% per annum for worldwide cover found themselves negotiating voyage-by-voyage surcharges of 0.5% or more to transit the Bab-el-Mandeb strait.
Voyage vs. Period Policies
Voyage policies attach at a named port of loading and terminate at the port of discharge. They are priced on a per-voyage basis and suited to operators making infrequent transits through elevated-risk areas who do not want to carry annual war risk exposure.
Period policies cover the vessel for a 12-month term wherever it trades. They offer certainty of basic hull war coverage but require owners to notify underwriters and pay AWRPs before entering JWC Listed Areas. For vessels regularly trading in contested waters, period policies with pre-negotiated AWRP schedules are operationally more practical than voyage-by-voyage placement.
Who Buys Marine Hull War Risk Insurance
Shipowners
The primary buyers are vessel owners — from single-ship companies to major shipowners with fleets in the hundreds. For owners trading globally, hull war cover is not optional: any standard H&M policy will contain an Institute Warranties provision that excludes trading in recognized war zones, meaning a vessel entering the Black Sea or southern Red Sea without hull war cover is uninsured for physical loss from hostilities. Lenders financing vessel mortgages typically require hull war coverage at all times.
Bareboat Charterers
Under a bareboat charter, the charterer assumes responsibilities equivalent to ownership, including insurance. Bareboat charterers must arrange hull war coverage independently and are directly exposed to vessel loss if cover lapses.
Operators and Managers
Third-party ship managers acting under a management agreement typically arrange hull war cover on behalf of the registered owner, coordinating placement with the hull underwriters and ensuring AWRP notifications are submitted before each listed-area voyage.
Flag-State Considerations
Flag state affects underwriter appetite in two ways. First, vessels registered under flags of open registries (Panama, Liberia, Marshall Islands) trade globally and carry standard war risk exposure. Second, vessels registered under flag states that are themselves parties to active conflicts — or that have been subject to sanctions — may face market withdrawal. Since 2022, several London market syndicates declined to write hull war for vessels flagged in or beneficial-owned by entities in Russia, Belarus, or Iran. Owners changing flag state in response to sanctions should notify their war risk underwriters immediately.
Claims: How a Hull War Risk Claim Differs from a Standard Marine Claim
A hull war risk claim is substantively more complex than a routine H&M claim in several respects.
Causation burden. The owner must demonstrate that the loss or damage was caused by a listed war risk peril — not navigational error, mechanical failure, or a concurrent cause that breaks the chain of causation. Where a vessel is damaged in an area of active hostilities, this burden is often met quickly. Where the damage is ambiguous — underwater impact, unidentified explosion — expert investigation (often involving salvage engineers and, in some cases, government forensic teams) will be required.
Constructive total loss and agreed value. Hull war policies are generally written on an agreed-value basis. If a vessel is a constructive total loss — meaning the cost of repair exceeds the agreed insured value — underwriters pay the agreed value, and the vessel is abandoned to underwriters. The agreed value under the war risk policy should match the agreed value under the H&M policy; a mismatch creates a gap that will not be filled.
Government condemnation. Where a vessel is detained or condemned by a government acting under a hostile or warlike order, the claim becomes a constructive total loss by seizure. These claims can take months or years to resolve, particularly where the seizing government disputes the owner's entitlement to compensation.
General average. A war-risk incident that results in a vessel being towed, jettisoned, or sacrificed may give rise to a general average declaration. War risk underwriters contribute to general average alongside H&M underwriters, and the apportionment of general average contributions — between cargo interests, hull interests, and freight interests — requires a general average adjuster. In practice, war-risk general average claims are among the most legally complex in the market.
Salvage. Vessels damaged in a war zone may face extraordinary salvage costs, particularly if commercial salvors decline to enter the zone without additional risk compensation. War risk underwriters will generally cover reasonable salvage costs attributable to a war peril, but owners should confirm this in policy wording before contracting salvors.
Recent Market Context
The period from 2022 to mid-2026 represents the hardest hull war risk market in a generation, driven by concurrent active conflict zones affecting global trade routes.
The Russian invasion of Ukraine in February 2022 immediately repriced Black Sea risk. Several underwriters withdrew capacity from the region entirely, and those who remained charged AWRPs that made voyage economics unworkable for some charterers — contributing to the insurance-driven rerouting of Black Sea grain traffic through alternative corridors. The MV Razoni, the first vessel to leave Odesa under the UN-brokered Black Sea Grain Initiative in August 2022, carried war risk cover arranged through specialist London-market underwriters; the premium rates for that voyage were not publicly disclosed but were reported to significantly exceed pre-war benchmarks.
The Houthi campaign that began in earnest in Q4 2023 — targeting vessels associated with Israel and its allies in the Red Sea — forced a second major repricing cycle. By Q1 2024, most major container carriers had suspended Red Sea transits in favor of Cape of Good Hope diversions, adding 10–14 days and significant fuel costs to Asia–Europe voyages. The MV Galaxy Leader, a vehicle carrier seized by Houthi forces in November 2023, became the most visible total war risk loss of the cycle, with the vessel and crew held in Yemen for an extended period following the seizure.
Lloyd's market capacity for hull war risk contracted modestly in 2024–2025 as syndicates reassessed accumulation exposure. The Singapore market increased its participation in Asian-fleet placements through its established marine and reinsurance carriers. IUA London members maintained broad participation but with tighter rate floors. The net effect: hull war risk remains placeable for most commercial vessels, but the era of nominal premiums is over. Underwriters who wrote hull war as a loss-leader to support H&M relationships have largely revisited that model.
Placing Cover: Path to a Quote
Marine hull war risk insurance is a specialty surplus-lines product in the United States. It is not available through standard admitted carriers and must be placed through a licensed surplus lines broker or a wholesale intermediary with established Lloyd's and London-market relationships.
Our practice routes marine hull war risk submissions through a specialist wholesale partner with direct Lloyd's access. To initiate a quote, you will need to provide vessel particulars (name, flag, IMO number, type, gross tonnage, agreed hull value), planned trading areas, and your existing H&M policy details. For vessels requiring AWRP for an imminent voyage, turnaround can be 24–48 hours through established market channels.
To request a hull war risk quote or discuss your fleet's exposure, use the form below or contact us directly.